Scientists don't know what lives in the water in many parts of the world. I go to remote places and talk to the people who live there. I ask them: What do you catch? I go to markets and look at the fish on sale there. In Africa, and many other places where I work, men tend to catch the fish that are sold to make money, but I pay attention to women and children. They catch the smaller, more obscure fish-the fish that the people themselves eat. I watch the women and girls fish, and I go fishing myself.